Drive for inking-roller carriages of platen presses



Aug. 18, 1925;. mmm@ E. GROSSE DRIVE FOR IN-KING ROLLER CARRIAGES OF PLATENRESSES Filed May ll. 1923 Patented Aug. 18, 1925.

UNITED STATES EDUARD GROSSE, OF WACHWITZ, NEAR DRESDEN, GERMANY.

DRIVE FOR INKING-ROLLER CARRIAGES OF PLATEN PRESSES.

Application filed May 11, 1923. Serial No. 638,281.

To all whom t may concern.'

Be it known that I, EDUARD GROSSE, a citizen of the German Republic, residing at VVachwitz,A near Dresden, Grundstr. 8, Germany, have invented certain new and useful Improvements in Drives for Inking-Roller Carriages of Platen Presses, of which the following is a specification.

The present invention relates to improvements in drives for inking roller carriages of printing presses of the platen type whose inking rollers rotate around the middle part of the press. The known types of drives for roller carriages of presses of this'kind consist either of flexible means, for instance chains, bands, etc., or rigid means like roller supports, discs, etc. v

The object of the present invention belongs to the group of rigid drives. The older kinds of drives known heretofore in this group all suffer from the fundamental defect that the manner of arranging the inking roller drive always weakened the power of the body of the machine to resist pressure. The cause of this was the unsuitable arrangement of the roller supports on the crank shaftI which runs through the whole width of the middle part of the body and extends on both sides over the outer frame wall for the purpose of securing the cranks and connecting rods which actuate the platen. The roller supports are arranged between the middle part of the body and the outer frame walls. As they rotate with the inking rollers around the middle part of the press, they require free passage between the middle part of the body and the outer frame. This free passage becomes possible only either by separating, or cutting through, the middle part of the body and outer frame. Connection between the middle body and outer frame is established in the older types of machines of this kind therefore solely through the medium of the crank shaft. But this connection is in no way suficient to offer proper resistance to the heavy pressure exerted by the platen. If a form is not locked exactly in line with the direction of the crank shaft bearing, the middle part of the body, serving as foundation, becomes resilient, and the results are unclean impressions, blurs or even breaks.

Attempts have been made to remove this defect by means of locking devices. These locking devices are usually provided on opposite parts of the middle body and act connect the middle body to the outer frame.

Aside from the fact that these locking devices are costly and subject to much wear, they do not succeed in increasing the power of resistance of the middle part of the body serving as printing foundation and do not prevent shifting, resiliency, blurs, etc.

This drawback of insufficient power of resistance of the middle body which serves as printing foundation is thoroughly 0vercome by the present invention through the provision of annular tooth wheel rims by means of which the carriages of the inking rollers are guided around the center of the press. By means of these annular tooth wheel rims a firm connection can be established between the .middle body and the outer frame. It is advisable to cast middle bodies and outer frame in one piece and to make t-he connecting piece broad and strong enough to resist even the highest pressure.

Annular tooth wheel rims are placed on both sides around the connecting points either in the discs which serve as runner rails for the inking rollers or ring lubricating bearings secured to both sides ofthe frame walls. In this manner the tooth wheel rims surround the broad, strong connecting surfaces ef the middle body and side walls like a ring whose internal diameter is large enoughgto permit it to comfortably revolve around the connecting surface.

The annular tooth wheel rims are driven to rotate by means of a toothed gearing whose ratio of gearing is dimensioned so that the rotation of the tooth wheel rims corresponds with the movement of the platen. The tooth wheel rims rotate in their bearings, take the inking roller carriages connected to them along and guide the latter around the middle body of the press.

Through this tooth wheel guide it is possible to impart to the body of the press the greatest possible power of resistance and, simultaneously, to obtain a sure and uni form guiding of the inking rollers.

One form of the invention is illustrated in the accompanying drawing, in which Figure l is a diagrammatic side elevation of the roller carriage guide and Figure 2 a sectional view A-B seen from above.

Connected to the frame a is the middle body ZJ which serves as printing foundation and carries the form f; this connection is rigid. In the middle body is the main shaft c on whose two ends are mounted cranks u which in cooperation with connecting rods e move the platen T.

To both sides of the machine are secured the ring-like discs g which are flattened at the printing surface f and on which travel the travelling rollers Z of the inking rollers p in the carriage (Z. The carriage Z moves in grooves y, provided in the discs g, around the center of the press.

The rotation of the roller carriage Z is caused by the annular tooth wheel rim 7c pivoted to the carriage. The tooth wheel rim 7c is driven by the spur gear wheel Z rigidly connected to the spur gear wheel a outside of the frame by means of a shaft 0 within the frame. Spur gear wheel a is driven by the crank wheel m mounted on the main shaft c and the former in turn is driven by the pinion ZL of the flywheel shaft.

The ratio of gearing of the toothed wheels is so dimensioned that at each rotation of the crank wheel m one reciprocatory movement of the platen T is caused and one rotation of the tooth wheel rim 7c. As the tooth wheel rim ZJ, by means of the connecting rod r, takes along the carriage (Z, the latter together with the inking rollers rotates once around the center of the press during each reciprocatory movement of the platen T while the inking rollers ink the form by passing over it.

The driving wheels m and n. are required on one side of the machine only, while in larger presses the spur gear wheels Z on the shaft 0 must be arranged on both sides of the machine as must also the tooth wheel rims 7c. In smaller machines a one-sided arrangement of the spur gear wheel Z and tooth wheel rim Z2 is su'mcient, as in this case the carriagecan be connected by. means of an angularly bent rod within the front traverse of the carriage.

By the peculiar' arrangement of the tooth wheel rim and the wheel drive m and n which remains outside of the frame the center of the press within the tooth wheel rim does not come in contact with the rotating roller carriages. It is therefore possible to connect at will the center of the press to the fra-me and impart to the connecting surfaces a high power of resistance. To obtain the highest possible power of resistance center and frame may also be cast in one piece. In this case it becomes necessary to divide the tooth wheel rim and the disc f/ into two halves which are mounted across the center of the press and screwed together.

The tooth wheel rim can also be used for guiding, in addition to the inking rollers, other rollers in the carriage around the center of the press, for instance transfer rollers which, for the purposes of indirect printing, transfer an impression taken from a form on the back of the machine to a rubber plate on the platen side; from the rubber plate, by means of the platen T, the impression is then printed on paper.

l. In roller carriage drives for platen presses equipped with inking rollers rotating` around the center of the press the combination of a printing foundation, a form, a platen, travelling rollers, a roller carriage in which the rollers are mounted, partly flattened annular' discs on which the traveling rollers run, a pivotally connected annular tooth wheel rim which is revolved by means of toothed wheel gearings, and also means which connectthe roller carriage to the Vtooth wheel rim.

2. In roller carriage drives for platen presses equipped with inking rollers rotating around the center of the press the combination of a printing foundation, a form, a platen, travelling rollers, a roller carriage in which the rollers are mounted, partly flattened annular discs on which the traveling rollers run, a pivotally connected annular tooth wheel rim which is revolved by means of toothed wheel gear-ings, and also means which connect the roller carriage to the tooth wheel rim whereby the roller carriage is moved around the press by means of the annular pivotally connected tooth wheel rim while during each reciprocatory movement of the platen the roller carriage with its inking rollers passes during its rotation around the center of the press between the printing foundation and platen and inks the form.

3. In roller carriage drives for platen presses equipped with inking rollers rotating around the center of the press the combination of a printing foundation, a form, a platen, travelling rollers, a roller carriage in which the rollers are mounted, partly flattened annular discs on which the traveling rollers run, pivotally connected annular tooth wheel rims which are revolved by means of toothed wheel gearings, and also means which connect the roller carriage to the tooth wheel rims whereby the roller carriage is moved around the press by means of the annular pivotally connected tooth wheel rims while during each reciprocatory movement of the platen the roller carriage with its inking rollers passes during its rotation around the center of the press between the printing foundation and platen and inks the form.

In testimony whereof I have affixed my signature.

EDUARD GROSSE. 

